1601664199 has 2 divisors, whose sum is σ = 1601664200. Its totient is φ = 1601664198.

The previous prime is 1601664173. The next prime is 1601664217. The reversal of 1601664199 is 9914661061.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 1601664199 - 2²³ = 1593275591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1601664149) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 800832099 + 800832100.

It is an arithmetic number, because the mean of its divisors is an integer number (800832100).

Almost surely, 2^1601664199 is an apocalyptic number.

1601664199 is a deficient number, since it is larger than the sum of its proper divisors (1).

1601664199 is an equidigital number, since it uses as much as digits as its factorization.

1601664199 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 69984, while the sum is 43.

The square root of 1601664199 is about 40020.7970810178. The cubic root of 1601664199 is about 1170.0124670549.

The spelling of 1601664199 in words is "one billion, six hundred one million, six hundred sixty-four thousand, one hundred ninety-nine".